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Forums
4hv.org :: Forums :: High Voltage
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The Fryback Transformer

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haxor5354
Tue Apr 05 2011, 07:56PM
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
 		why does it have to be in a disk shape again?
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Inducktion
Tue Apr 05 2011, 07:57PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
haxor5354 wrote ...

why does it have to be in a disk shape again?

The disk shape reduces capacitance and thus reduces ringing on the secondary side. Plus capacitance can introduce other problems such as arcing between layers.
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Adam Munich
Tue Apr 05 2011, 09:57PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		It also reduces the voltage difference between layers. Right now my transformer has a maximum of 250V between layers, which isn't much at all.

I'll look into getting a plastic or wood clamp made. I want it to look nice, so looks like I'll have to fire up autodesk...
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James
Tue Apr 05 2011, 10:37PM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Grenadier wrote ...

It also reduces the voltage difference between layers. Right now my transformer has a maximum of 250V between layers, which isn't much at all.

I'll look into getting a plastic or wood clamp made. I want it to look nice, so looks like I'll have to fire up autodesk...


I just held the core up against a scrap of polycarbonate and traced around it with a fine tip Sharpie marker. Cut that out with scissors and cleaned up the edges with sandpaper. Only took a few minutes and came out fine.
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Adam Munich
Tue Apr 05 2011, 10:40PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		That's all well and good, but I'd like it to stand up like it does now. Trying to figure out how to accomplish that.
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magnet18
Wed Apr 06 2011, 05:18AM
magnet18 Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location: 1307912312 3766 FT117575 Indiana State
Posts: 624
 		How'd you get copy of autodesk?
I searched for hours and couldn't find it for less than a LOT of money.
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Adam Munich
Fri Apr 15 2011, 05:30AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		So I did away with the clamp entirely and opted for two paper tubes, which when wrapped up with electrical tape exert enough friction on the core to keep it held together.

I made a new primary, still 4+4 turns but this time I used 2 strands of 18ga wire instead of litz. I think it looks much cooler.

[piccy of new transformer]

So I proceeded to hook it up to 48V and GAHHhnxdbbdursxhneuHolyShit!!! Just watch this video...


@magnet18, here's a hint; it starts with a tor and ends with a rent.
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Josh
Fri Apr 15 2011, 05:39AM
Josh Registered Member #938 Joined: Sat Aug 04 2007, 05:39AM
Location: Honokaa,HI,USA
Posts: 65
 		Holy cow!
I was smiling looking at the video :)
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Turkey9
Fri Apr 15 2011, 06:54AM
Turkey9 Registered Member #1451 Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
 		Nicely done there! How many turns would you guestimate are on that beast?
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Patrick
Fri Apr 15 2011, 06:55AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Grenadier wrote ...

@magnet18, here's a hint; it starts with a tor and ends with a rent.
I use autoCAD 2000, 2007 and Inventor, despite everyone else on the planet insisting Solid Works is a gift from Jesus himself. And yes they're illegal cracks.
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